-ol bbb bbg bbi bbl bbo bbt bgb bgg bgi bgl bgo bgt bi- bib big bii bil bio bit blb blg bli bll blo blt bob bog boi bol boo bot btb btg bti btl bto btt gbg gbi gbl gbo gbt ggb ggg ggi ggo ggt gib gig gii gil gio git glb glg gli gll glo glt gob gog goi gol goo got gtb gtg gti gtl gto gtt ibb ibg ibi ibl ibo ibt igb igg igi igl igo igt iib iii iil iio iit il- ilb ilg ili ill ilo ilt io- iob iog ioi iol ioo iot itb itg iti itl ito itt lbb lbg lbi lbl lbo lbt lgb lgg lgi lgl lgo lgt lib lig lii lil lio lit llb llg lli lll llo llt lob log loi lol loo lot ltb ltg lti ltl lto ltt o-i ob- obb obg obi obl obo obt ogg ogi ogl ogo ogt oib oii oil oio oit olb olg oli oll olo olt oo- oob oog ooi ool ooo oot ot- otb otg oti otl oto ott tbb tbg tbi tbl tbo tbt tgb tgg tgi tgl tgo tgt tib tig tii til tio tit tlg tli tll tlo tlt to- tob tog toi tol too tot ttb ttg tti ttl tto ttt